my take of a fidget spinner. two models, either use one 608 bearing or three 608 bearings. I find bearings spin better if soaked in WD-40 for 48 hours to remove the thick grease. then wash with hot soapy water to remove WD-40.

40% fill on the one bearing model. Less infill for the 3 bearing model.

homemade 3D Delta

No

No

.2 or .3

40% or 25%

on my home made MDF Delta printer, 608zz bearing fits in perfectly. I push the bearings in with my thumb and friction holds them in place. No glue. your printer may differ. The design has the bearing hole(s) at exactly 22 mm (r=11).